.\" $OpenBSD: d2i_X509_ALGOR.3,v 1.10 2021/11/03 15:02:14 schwarze Exp $
.\"
.\" Copyright (c) 2016, 2021 Ingo Schwarze <schwarze@openbsd.org>
.\"
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.Dd $Mdocdate: November 3 2021 $
.Dt D2I_X509_ALGOR 3
.Os
.Sh NAME
.Nm d2i_X509_ALGOR ,
.Nm i2d_X509_ALGOR ,
.Nm d2i_X509_ALGORS ,
.Nm i2d_X509_ALGORS
.Nd decode and encode algorithm identifiers
.Sh SYNOPSIS
.In openssl/x509.h
.Ft X509_ALGOR *
.Fo d2i_X509_ALGOR
.Fa "X509_ALGOR **val_out"
.Fa "unsigned char **der_in"
.Fa "long length"
.Fc
.Ft int
.Fo i2d_X509_ALGOR
.Fa "X509_ALGOR *val_in"
.Fa "unsigned char **der_out"
.Fc
.Ft X509_ALGORS *
.Fo d2i_X509_ALGORS
.Fa "X509_ALGORS **val_out"
.Fa "const unsigned char **der_in"
.Fa "long length"
.Fc
.Ft int
.Fo i2d_X509_ALGORS
.Fa "X509_ALGORS *val_in"
.Fa "unsigned char **der_out"
.Fc
.Sh DESCRIPTION
.Fn d2i_X509_ALGOR
and
.Fn i2d_X509_ALGOR
decode and encode an ASN.1
.Vt AlgorithmIdentifier
structure defined in RFC 5280 section 4.1.1.2.
.Pp
.Fn d2i_X509_ALGORS
and
.Fn i2d_X509_ALGORS
decode and encode an ASN.1 sequence of
.Vt AlgorithmIdentifier
structures.
The data type
.Vt X509_ALGORS
is defined as
.Vt STACK_OF(X509_ALGOR) .
.Pp
For details about the semantics, examples, caveats, and bugs, see
.Xr ASN1_item_d2i 3 .
.Sh SEE ALSO
.Xr ASN1_item_d2i 3 ,
.Xr STACK_OF 3 ,
.Xr X509_ALGOR_new 3
.Sh STANDARDS
RFC 5280: Internet X.509 Public Key Infrastructure Certificate and
Certificate Revocation List (CRL) Profile
.Sh HISTORY
.Fn d2i_X509_ALGOR
and
.Fn i2d_X509_ALGOR
first appeared in SSLeay 0.5.1 and have been available since
.Ox 2.4 .
.Pp
.Fn d2i_X509_ALGORS
and
.Fn i2d_X509_ALGORS
first appeared in OpenSSL 0.9.8h and have been available since
.Ox 4.5 .
